My ex boyfriend is dating my cousin

Marrying a cousin is usually considered a bad idea, because inbreeding can lead to harmful genetic conditions. But paradoxically, in some societies, marrying a related spouse is linked to having more surviving children, research suggests. In traditional residential societies, couples who were more closely related to each other had more children.

Marrying your first cousin, while illegal in many states, is not the worst thing you could do. But the situation gets hairy if several generations.

A woman seeks to know the risks of dating —and the risk of having offspring with—a relative. I want to date a fourth cousin of mine. Is that wrong? We do not plan to have any children together, but if we did, would there be a risk of passing along a genetic defect or disorder? Your question is a surprisingly common one received by genealogy researchers, not only for dating but also for marriage.

Generally, questions arise when the couple in question are second cousins sharing a great-grandparent or closer. An estimated 1 billion people worldwide live in communities where marriage between people who are second cousins or closer known as consanguineous marriages are preferred by tradition. However, in the United States only 0. For instance, as of , first-cousin marriages were illegal in 25 American states and restricted in six others e. Married actors Kevin Bacon and Kyra Sedgwick found out that they are ninth cousins once removed, and action star Michelle Rodriguez learned that her Puerto Rican forebears preferred to marry first cousins in order to preserve a high degree of European ancestry and lighter complexions in their offspring.

Cousin marriage figured into the life of Henrietta Lacks , the black woman whose cancer cells were taken in without her knowledge and later used in the development of many medical breakthroughs. Kirkpatrick to weigh in. She told us the following in an email:.